Improvement in steam-generators



UNITED STATES BIRDS'ILL HOLLY, OF LOOKPOBT, NEW YORK.

IMPROVEMENT IN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 53,617, dated April 3,1866.

To all rrhom it may concern Be it known that I, BIRDsILL HOLLY, ofLockport, in the county of Niagara and State -of New York, have inventedcertain new and useful Improvements in Steam-Boilers; and I do herebydeclare that the following is a full and exact description thereof,reference being had to the accompanying` drawings, making part of thisspecification, in which-v Figure 1 is a central vertical section; Fig.2, a horizontal section thereof in the plane of line a' x,- Fig. 3, adiagram of the end of one of the tubes, looking from beneath, showingthe manner of welding the same.

Like letters of reference indicate corresponding parts in all thefigures.

My invention consists in the combination and arrangement of pendentwater-tubes with horizontal flues near the top of the tire-chamber,arranged radially around said tubes, and communicating with a hot-airspace inclosing the water-chamber of the boiler.

In the drawings, Afrepresents the waterspace of the boiler, which ispreferably of cylindrical form, and placed upright over the firespace B,and having an annular portion eX- tending downward around thefire-chamber, forming the water-jacket a.

The bottom plate, b, ofthe water-space of the boiler is provided withpendent tubes c c, secured to the same, which descend into thefirechamber B, and which open into the. waterspace A. A

(l d are horizontal tlues passing from the upper portion of thefire-chamber, through the water-jacket a, into a hot-air cham ber, O,which is also of cylindrical form, to correspond with that of thewater-space, which it incloses at the top and sides, extending downwarda short distance (which may be more or less) below the openings of thelines. At the top and center of this hot-air chamber is the outlet orsmoke-pipe l), for the escape of the products of combustion.

The top and bottom of the water-space are secured against expansion fromthe pressure of steam within by the ordinary stay-rods or struts e e. l

The operation ofmyimproved boiler thus constructed is as follows: Thechamber A being supplied with the proper amount of water, lire iskindled beneath on the grate E, when the heat rising to thetop of thefire-chamber, its direction is turned horizontally outward, when it mustcirculate around and between the tubes before escaping through the ues dd into the surrounding air-chamber, whence the heated products ofcombustion, after passing u p the sides of the water-space, convergeover the top to the center thereof, where they escape through the pipeD.

My improved boiler possesses the advantage of a large amount ofheating-surface in a most compact form, the usual amount of surfacebeing greatly increased by the tubes, flues, and the surface inclosed bythe hot-air chamber O, which is ordinarily exposed to the radiationinstead of the absorption of heat.

In the use of my improvement the products of the tire rising directlyagainst the bottom of the water-space, and surrounding and circulatingamong the tubes, heat the water ina rapid manner; and this is still moreperfectly accomplished by the arrangement of the lines, whereby theheated currents in their passage through them impart their heat to thewater in the jacket a.

The hot-air chamber, incasing as it does the main portion of the boileror space A, and by being constantly filled with the products ofcombustion, prevents all contact of the cX- ternal cold with the surfaceof the steam and water space and the resultant condensation of steam andconsequent foaming of the water, which are the deleterious effects thatensue when no Isuch surrounding air-chamber is employed.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination and arrangement of the vertically-pendent tubes c c withthe furnace B, iues d fl, and water-jacket a, substantially in themanner and for the purposes described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

BIRDSILL HOLLY. Witnesses:

GHAs. G. HILDEETH, J K. McDoNALD.

